var onPersonsAdded = function(persons) {

  for(var i = 0; i < persons.length ; i++) {
    var person = persons[i];

    // name
    // person.person.displayName

    // image url
    // person.person.image.url

    // image object
    // person.person.image

    // https://developers.google.com/+/hangouts/reference#gapi.hangout.Participant
  }
};
